Chapter 3: Networking and Advanced Settings
Chapter 3
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Basic Web Page Group
Setup Web Page (Fig. 16)
This page gives you the ability to enter some data your cable
company may require, as explained before in Mandatory User
Configuration. In addition, it enables you to change your
default LAN side IP address from 192.168.0.1, and to view your
WAN side IP address and lease information.
Your gateway can provide NAT/PAT (Network and Port Address
Translation) as an element of security to prevent others from
reaching your PCs when not authorized. To accomplish this, the
gateway watches packets you send from your PC to Internet
sites. Each time you send to a site (destination IP address) and
application at that site (port), it translates your PC’s original IP
and source port to new ones, and adds a row to its Connection
Table maintained internally. (Note the different meaning of
‘connection’ here to describe an IP connection versus a physical
cabling connection). If and when that site/application replies, it
looks up the connection and reverses the IP/port process to
direct the response to your PC.
The Connection Table manages itself, but you can also force
this table to be cleared manually. To do this, click the Renew
NAT Lease button.
You can enter a spoofed MAC address that causes your gateway
networking stack to use that MAC address when
communicating instead of the usual WAN MAC address (CM
label + 2, as explained in Chapter 1). Enter the desired MAC
address and press Apply.
Caution: If you enter a MAC address in use by another party, it
can cause an address conflict on the network that could affect
both you and that party.
Fig. 16
16096620 DCW615/25. 03 Network
6/26/03, 10:45 AM
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